• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

A WE-91B project

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I have tried DC heater to 300B and 310A, there is a few changes of noise, so I decided using AC heater finally.
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Thanks for all friends in helping me finished this project
 
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